Accumulator-electrode.



UNITED STATES PATENT orrron Lunwre srRAssER, oF-oHARLor'TEnBu-Re,GERMANY.

' AccuMU A'ron-ELno rnonE'.

I Specification of Letters Patent.

Patented July 23, 1908'.

Application filed August 20.1904; Serial No. 221,577.

To all whom it may concern:

Be it known that I, LUDWIG subject of the King of Bavaria, chemist, and

, ments in Accumulator Electro'des, of which the following an exactspecification;

In order to increase the conductivity of the active mass of accumulatorelectrodes it has .been pro osed to add retort carbon, coke,

and grap ite. The latter is further intended to be used in the form ofscales to prevent the active mass iromfalling out ofv the perforatedshell.

r -The applicant has'now found that graphite in the form of scales isevensurpassed by that form of carbon which is obtained by thecarburation of organic substances- (at high temperature) preferablycellulose,

provided that the starting material, such,g

forexample as paper and straw has a suitable form. This form of, carbonhas in the first place the advantage over the scalegraphite in beingharder; therefore it retains better its original form during'thetreating and pressing of the paste. Further, it offers the possibilityof giving the separate pieces of carbon any desired form, such forinstance as thin plates or disks, or strips and threads and the like,such'as are employed for elec tric incandescent lamps; by this form ofcarbon the conductivityand. coherence of the r active mass is improvedas much as possible.

STRASSER, a

. 7 strips and the like of the carbon is explained by the'fact thatialarge number of particles of the comparatively ill conducting activematerial come into contact with the surface of awell conducting strip orthread of carbon, and by the fact that such threads fill the active masswith-a net work of conductive niaterial which gives a much bettervcontact used, whilezit prevents the material from falling out throughthe small-perforations in the metal shell. ,1

certained thenature ofiny invention, what I desire to secure by LettersPatent of the United States is: a

An electrode for accumulators having an unchanging electrolyte, whichelectrode consists of active materialof relatively poor conductivity andan admixture of a mass of particles of carbon which isthe result ofhighly heating particles"oforganic substances having definite formadapted to produce contact and coherence throughout the mass, and theparticlesof carbon retaining the form of the particles of organicsubstances, a In testimony whereof I .have signed my name to thisspecification in the' presenceof two subscribing witnesses.- i -LUDW-IGrSTRASSEB.

Witnesses HENRY HAsPER, "WoLDn A'R HAUPT'.

The improvement in conductivity by using Having now particularlydescribed and asthan is possible to get if scales ,of'graphite are

